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Evolution of the oesophageal pressure (Poes) swing and the transdiaphragmatic pressure swing (Pdi) during spontaneous breathing (SB), a clinical setting of noninvasive continuous positive airway pressure (CPAP Clin), a physiological setting of noninvasive continuous positive airway pressure (CPAP Physio) and a physiological setting of noninvasive CPAP+1 cmH2O (CPAP Physio + 1). BPD: bronchopulmonary dysplasia, UAO: upper airway obstruction.
